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I.. S. LOCKWOOD. DOUBLE TRACKER MUSICAL INSTRUMENT. APPLICATION man JAN.2o. 191s.

1,814,068. PatentedAug. 26,1919.l

4 SHEETS-SHEET l.

ATTUHNEY- L. S. LOCKWOOD. DOUBLE TRACKER MUSICAL INSTRUMENT.

APPLICATION FILED JAN. 20, 19|6.

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9. mp1@ 00 H 5 m. QA @www D Y 1TH o T QM E 6u N N M Mw R gs u D Mm .Wd Tdw T 4 n n FITI.

L. S. LOCKWOOD.

DOUBLE TRACKER MUSICAL INSTRUMENT. APPLICATION FILED IAN.20. IsIs.

Patented Aug. 26, 1919.

4 SHEETS-SHEET 3.

HTTIJR N EYE.

rrm; COLUMBIA' PLANoaR/IPII COI, WASHINGTON. D. c.

L. S. LOCKWOOD.

DOUBLE TRACKER MUSICAL |NSTRUMENT. APPLlcAxoN FILED mazo. |916.

1 ,3 1 4,068'. Patented Aug. 26, 1919.

4 SHEETS-SHEET 4.

d INvENTDR ATTDRNEY 'nu COLUMBIA PLANOGRAPH Co., WASHINGTON, D. c.

UNITED STATES yPATENT OFFICE.

LOUIS s. LOcKwOOD, OF BUFFALO, NEW YORK, AssIGNoR To TIIF RUDOLPHwURLITzFR MANUFACTURING COMPANY, OF NORTH TONAWANDA, NFW YORK, ACORPORA- TION OF NEW YORK.

DOUBLE-TRACKER MUSICAL INSTRUMENT.

Specification of Letters Patent. Patented A110'. 26, 1919.

Application filed January 2o, 191e.` seriai No, 73,150.

T 0 all 'whom t may concern.' y

Be it known that I, LOUIS S. LooKwooD, a. citizen of the United States,residingfat North Tonawanda, in the county of Erie and State of NewYork, have invented new' and useful Improvements in Double-TrackerMusical Instruments, of which the following is a. specification. v

This invention relates to ardouble-tracker instrument which isespecially desirable for moving picture theaters, and more particularlyto an instrument of this kind inwhich one or more pipe-stops, such asviolin and flute pipes, and other instruments are combined with thepiano. k

The object of my invention yis the provision of an efficient and`reliable instrument ofy this character which may be played automaticallyor manually, with or without the pipe-stops, and which meets variousother requirements of theater instruments, such as permitting pieces tobe conveniently selected on eithermusic sheet while the other is beingplayed, or one music roll to be changed while the other is being played,and automatically playing the sheets alter'- nately or successively tofurnish continuous music, if desired. n

In the accompanying drawings:

Figure 1 is a front elevation of an automatic piano embodying theinvention with the front wall of the case removed and the piano actionand the strings omitted for clearness. Fig'. 2 is a diagrammatic Viewshowing the roll-driving and controlling mechanism of the two trackers..FigLS is an enlarged, fragmentary front elevation of he roll-drivingmechanism of one of the trackers. Fig. 4f is an end elevation of thesame. Fig.' 5 is an enlarged sectional elevation of a set of thecontrolling pneumatics. Fig. G is a similar view of one of the pushbuttons and pallets. Fig. 7 is a sectional elevation of the duct-boardand pallets and their controlling mechanism. ,Y Figs, 8 and 9 aretransverse sections on the correspondingly numbered lines in Fig. 7.Fig. 10 is a fragmentary longitudinal section ofv one of the playingpneumatics. Fig. 11 is ,anl enlargedsectional top plan view of theauxiliary wind chest. Fig. 12 is a fragmentary perspective view thereof,partly in section. Fig. 13 is a fragmentary top plan view, partly insection, of one of the stop-action chests. Fig. 14 is a sectionalperspective view of a fragment thereof. Fig. 15 is a transverse sectionof the manually controlled valve box. Fig. 16 is a transverse verticalsection of one of the pipe-wind chests. y

Similar characters of reference indicate corresponding parts throughoutthe several views., y

1 indicates the main wind chest containing a pneumaticplaying action ofany suitable construction, and 2, Fig. 2indicates one of Athe customarystriker pneumatics. The wind chest is connected with the usual mainsuction bellows 3 operated by an electric or other .suitable motor 4:, atrunk connecting the said chest with said bellows. n Y

The instrument contains a. plurality of trackers and associatedroll-driving and controlling mechanisms, two being shown in the drawingswhich are generally designated by the reference letters A and B,respectively. For brevity they are hereinafter referred to as trackersA, B, andbeing identicalv inconstruction, a description of one willapply to both.

G indicates the tracker board, 7 the music roll, 8 the take-up roll, and9 the music sheet. The take-up roll is engaged with the usual clutchmember 10 secured to the takeup shaft 11, while the music roll isengaged by theclutch member 12 secured to the rewind shaft 13, whichshafts are journaled in the cheeks 14 of the tracker boxes. The rewindshaft lcarries a spur gear 15 engaging: with an idler 16. `Mounted onthe takeup roll shaft 11 is a spur gear `17.

The rolls of each tracker-box preferably have a separate ,driving shaft1S supported horizontally in the boX. Fixed to this shaft adjacentA toeach tracker box is a spur gear' 19 and `pivoted upon the shaft is avertically movable shifting member or shipperarm20 carrying twotransmission gears 21,A

22, which are secured to a spindle 25 journaled in said arm. The gear 21meshes constantly with the driving gear 19 on the main drive shaft 18.When the arm 20 is lowered, the gear 21 meshes with the rewind idler 16to rewind the music sheet, while when said arm is raised, the gear 22meshes with the take-up gear 17 to take up the music sheet.

The driving shafts 1S are preferably position. As shown, thesepneumatics-may be combined in a duplex pneumatic having a. singlemovable board 27 and the arm 2O is connected with said board by a link26.

A spiral spring 28 shown in Figyl() isa'r-` v ranged inside of thesepneumatics and provided with an adjusting screw'29, extending throughthe stationary board 30. These springs tend to keep the pneumatics in aneutral position in which the transmitting gears 21, 22 are disconnectedfrom both gears 16 and 17. These pneumatics are individually connectedwith an auxiliary wind chestJ 31 preferably arranged beneath the keytable and having, its main suction chamber connected by the trunk 5 withthe main suction bellows 3. The take-up or playing pneumatic 23 oftracker A is connected by a conduit 33 with a valve chamber 34 in theauxiliary chest 31 which chamber is connected with the atmosphere byport-s 34"L and with the suction chamber 32 by ports 32al which arecontrolled by a secondary duplex valve 35 ot ordinary construction. Thisvalve is controlled by a diaphragm 36 located iii the diaphragm chamber36 to which leads a channel 37 connected with a valve chamber 38 whichis connected with the atmosphere by ports 37@l and with the suctionchamber 32 by ports 38a. These ports are controlled by a primary orplaying valve 39, the heads of which are arranged on the outer side ofthe chamber 38. This valve is controlled by a. diaphragm 40 covering thediaphragm chamber 40u.

A channel or by-pass 41 provided with the customary bleeds 42, 43connects the diaphragm chamber 40l with the valve chamber 38. `When theprimaryplaying valve 39 is raised by the diaphragm 40, atmosphere passesthrough the by-pass 41 and acts upon said diaphragm, holding said valvein that position until allowed to drop by the action of the releasingvalve hereinafter described. Under these conditions, atmosphere alsoenters the channel 37 and raises the valve 35, allowing the tension inthe chamber 32 to collapse the playing pneumatic 23. Leading to thediaphragm-chamber 40a is a con- .duit 44 which is connected with a duetor channel 47 formed in a. duct-board 46 and having a lateral port 45,as shown in Figs. 7 and 8. This port is controlled by a valve 48preferably consisting of a spring-pressed pallet, as shown. This palletis connected by a link 49 with a pneumatic 50.

The valve 39 is lowered or released preferably by the following means:

51 indicates a pouch chamber located in the auxiliary chest 31 andconnected by a channel 52 with a valve chamber 53 which 'is connectedwith the atmosphere by ports 54 and with thesuction chamber 32l byports55. These ports are controlled by a duplex releasing or stop-valve 56similar to the val-ve35,---which -inlturn is controlled by a'p'orts"59`,""60, the port 60 leading directly from the suction chamber32 to the space inclosed by said pouch, and the port 59 leading to theby-pass 41` Thus by the raising of the releasing valve 56 the pouchchamber 51 is placed in communication with the suction chamber 32 andthe pouch 58 is raised from the ports 59 and 60, exhausting the by-pass41 and allowing the primary playing valve 39 to drop. yThe channel 37 isthereby connected with the suction chamber 32, lowering the secondaryvalve 35 and cutting oit communication lbetween the suction chamber 32and the playing pneumatic v2,3, thereby flushing the latter andreturning the corresponding shipper arm 20 to neutral position. Thereleasing diaphragm 57 is connected Iby a conduit 61 with an atmosphericduct 61'a in the valve board 46, to which duct leads a port 61D,controlled by a spring-pressed pallet 61e which normally closes saidport. This pallet 6lc is connected by a link 62 with a pneumatic 63.

As shown in Fig. 2, the playing bellows 23 ot tracker B is connected bya conduit 64 with the primary and secondary playing valves 64, 65 in theauxiliary wind chest 31, which valves are identical in construction withthe corresponding primary and second.- ary valves 39` 35, of tracker A.The valve 64a is raised bya diaphragm connected by a conduit 66 with achannel 67 in the board 46 from which leads a. port 67a controlled bythe pallet 61c and is released by a duplex valve 68, similar to valve56, in order to raise the secondary valve 65, and flush the playingpneumatic 23 of tracker B, thereby returning the roll-driving mechanismthereor' to neutral or inoperative position and stopping thecorresponding music sheet. The diaphragm of the releasing valve 68 isconnected by a. conduit 69 with a channel 70 and port 70'DL in the board46, which port is controlled by the pallet 48.

The pneumatic 50 is connected by a conduit 71 with a valve chamber 72which communicates with the atmosphere and the suction chamber 32 byports 74 and 75. These ports are controlled by a duplex valve 76actuated by a diaphragm 77 to which leads conduit 78 connected with acontrolling duct 7 9 of the tracker B. The pneumatic 63 is connected bya conduit 71a with a vvalve chamber similar to the chamber 72 and iscontrolled by a Valve 76a to thu liaphragm of which leads a conduit 78*L connected with a controlling duct 7 9 of the tracker A. It will thusbe seen that the playing pneumatic of tracker A is collapsed by theopening of the pallet valve 48 and flushed by the opening of the pallet61, while the playing pneumatic 23 of tracker B is collapsed by theopening of the pallet 61c and flushed by the opening of the pallet 48.

The rewind pneumatic 24 of tracker A is controlled by primary andsecondary rewind valves 81, 82 and a releasing valve 83 similar to thevalves 39, 35 and 56 ofthe playing pneumatic 23 of said tracker, 80indicating the conduit which connects saidl rewind pneumatic with saidsecondary valve 82, and S1a a conduit which connects said primary valve81 with achannel 81b and a port S1@ in the duct board 1116. lThis'portis controlled by the pallet 612 The releasing valve S3 is connected by aconduit 83a with a channel 83b and a port 83c in the board 46, whichport is controlledby the pallet 4:8. The rewind pneumatic 24 of trackerB is likewise vcontrolled by similar' primary and secondary rewindvalves S5, S6, and a releasing valve 89, said pneumatic being connectedwith the secondary rewind valve 86 by a conduit 841, while said primaryvalve is connected by a conduit 87 with a channel 88 and a port 88controlled yby the pallet 48, and the releasing valve 89 is connected bya conduit 90 with a channe191 and a port 91a controlled by the pallet61B.

By this construction and arrangement of the controlling mechanism, theplaying pneumatic 23 of one tracker and the rewind pneumatic 24 of theother tracker are simultaneously collapsed, thus taking up the musicsheet of one tracker and at the same time rewinding the sheet of thevother.

rlhe actuation ofthese sets of playing and rewind pneumatics isautomatically controlled after the playing of each music sheetbyperforations 92 located near the ends of the sheets and ,coperatingwith controlling ducts 79 of the tracker boards, each board having oneof such ducts.V

After a Vsheet has bee-n rewound, its rewind mechanism is automaticallystopped by any suitable means. The preferred mecha-,

nism shown in the drawings is constructed as follows: I I

93, Figs. 2, 3 and 1, indicates flushing valves respectively locatedadjacent to the roll driving mechanisms of the trackers and eachconsisting of a spring-pressed pallet which normally closes aflushin'gport 93ain a block94f. The port 93a of the tracker A isconnected by a conduit 95, channel 83b and conduit 83 with the diaphragmof the releasing valve S3 which controls the rewind pneumatic of trackerA. The port 93L of the tracker B is connectedby conduits 96 and 90 withthe corresponding releasing valve 89 of the rewind pneumatic of trackerB.

97 indicates fingers which coperate with the take-up rolls S,respectively, and Control the flushing valves 93. Each of these fingersis pivoted to a rock arm 98 secured to a horizontal rock shaft 99arranged parallel with the take-up roll and supported in the adjacenttracker box. This shaft has an actuating arm 100 which is connected by alink 101 with one end of a lever 102 pivoted at 102L tothe tracker box.A link 103 connects the opposite end of said lever with the flushingvalve 93. As seen in Fig. 41, the 1inger 97 of each tracker box bearsagainst the convolutions of the music sheet opposite a transverse groove10-1 in the periphery of the take-up roll, the finger bearing constantlyagainst the music sheet by its own weight. This recess has anabrupt rearend 105 referring to the direction of travel of the take-up roll duringthe rewinding of the music sheet. So long as the recess rcmains coveredby the music sheet during the rewinding operation, the finger is held ina retracted position, as shown in Fig. 1, but when the recess isuncovered by the complete unwinding of the music sheet, the finger dropsinto the recess, bringing` its free end into the path of the abrupt endthereof which thereupon depresses the finger and causes the shaft 99 tobe rocked in the proper direction to open the valve 93. rlhe releasing`valve 83 or S9, as the case may be, is thereby actuated, inflating therewind pneumatic 24 and shifting the transmission gear 21 into neutralor stop position. A pin 106 projecting laterally from the lever 102 intothe path of the rock arm 20, is preferably employed to assist the rewindpneumatic in disconnectingl the transmission gear 21 from the idler 16.

During the rewind of each music sheet, the companion tracker is cut ofizfrom the main wind chest 1 by anyr suitable means, but I prefer toemploy the mechanism shown in the drawings which is constructed as follows:

` 107, Fig.'2, indicates a cut off or chest preferably arranged on topof the main wind chest 1 and Vcontaining a pair of pouch or valvechambers 10S and 109. One of these chambers, say the chaiuber 108, isconnected by a conduit 110 and the conduit 33 with the secondary valvechamber 31- of tracker A, while the chamber 109 is connected by aconduit 116 and the conduit 6l with a valve chamber, similar to thevalve chamber 311, controlled by the secondary valve 65 of tracker B,whereby each of said chambers is alternately exhausted and flushed bythe raising and lowering of the secondary valves 35 and 65,respectively. Arranged in the cut off chest 107 adjacent to the pouchchamber 108 are a plurality of channels 112, respectively connected withthe note ducts 72 of tracker A by conduits, one of which is shown at113, and arranged adjacent to the other pouch chamber 109 is a similarset of channels 114 respectively connected with the note ducts 72 oftracker B, by conduits, one of which is shown at 115. The pair or set ofchannels 112 and 114 corresponding to like note ducts of the two trackerboards 6, both communicate with a common channel 116a leading to theprimary pneumatic 117 which controls the valve 118 of the correspondingstriker pneumatic 2. Each of the channels 112 is interrupted by apartition 119 and provided at opposite sides thereof with ports 120which are covered by a pouch or diaphragm 121 secured at its edges tothe bottom of the upper pouch chamber 108. This pouch forms a valve,which, when lowered against the upper edge of the partition 119, closesthe ports 120 and cuts off communication between the correspondingstriker pneumatic 117 and the corresponding duct of the board 6 of thetracker A; while when said pouch valve is raised, it .opens the ports120 and forms a passage between them, thereby connecting said strikerpneumatic with the corresponding tracker board duct. It will beunderstood that there is such a pouchvalve for each channel 112.

Each of the channels 114 has a similar partition 122 and a pair of ports123 controlled by a pouch-valve 124.

From the foregoing it will be seen that when the playing pneumaticbellows 23 of tracker A is collapsed by the opening of the pallet 48,the pouch chamber 108 of the corresponding tracker is at the same timeexhausted, opening the pouch-valves 121, as shown in Fig. 2, andcouplinothe tracker r. to the main wind chest. Bimultaneously with thisaction, the pouch chamber- 109 is flushed by the opening of port :l bysaid pallet 48, closing the ports 123 and cutting 0H the tracker B fromthe main wind chest. Likewise, when the pallet 61c is opened, the pouchvalves 124 corresponding to tracker B are opened and the pouch valves121 corresponding to tracker A are closed, coupling the latter to themain wind chest and cutting off the tracker A therefrom.

lVhile one music sheet is being played,` it is desirable at times toselect some particular piece on the idle sheet and bring it intoposition ready to be promptly played'. This is preferably accomplishedby the following means:

The shaft 11 of the take-up roll is provided with an auxiliary spur gear125 which engages an idler 126 journaled on a vertically movable arm orshifting member 127 pivoted on the shaft 11. This idler is in turnadapted to engage the spur gear 19. The several gears are soproportioned that whenthe idler 126 is moved to operativeposition,'thetake-up roll isdriven forwardly more rapidly than playingspeed, thus saving time in selecting the desired composition.

' Each ofthe v'gear-carrying arms 127 is shifted in one direction by aselecting pneumatic 128 connected with it by a link 129 and serving,when collapsed, to lower the arm into operative position. A spiralspring 130 raises the arm 127 into inoperative position when saidpneumatic 128 is ushed. The two selecting pneumatics 128 of the trackersA and B are connected by conduits 131, 131a with separate valve chambersin the auxiliary wind chest 31 controlled by secondary valves 132, 133and corresponding primary valves 134, 135. The primary selecting valve134 of tracker A is connected by a conduit 136 with a duct 137 formed ina duct board 137a controlled by a pallet-valve 138 shown in F i g. 6.This duct is operated by a push-button 139. The primary selecting valve135 of tracker B is connected by a conduit 140 with a duct controlled bya similar pallet valve having a push button 141. By pushing one or theother of the buttons 139, 141 the corresponding selecting pneumatic 128is collapsed, shifting the associated selecting gear into operativeposition.

At the end of each piece on the music sheet, there is preferably astop-perforation 148 which coperates with a corresponding tracker ductand serves to arrest the forward selecting movement of the sheet. Forthis purpose, a releasing or select off valve 142 located in theauxiliary wind chest 31 is connected by a conduit 143 with a duct 144 oftracker A cooperating with such a stop perforation, while a similarreleasing or select off valve 145 is connected by conduit 146 with aduct 147 of tracker B. These select-oil valves 142 and 145 act upon thesecondary selecting valves 132 and 133 in the same manner as thereleasing valve 56 acts upon the secondary valve 35, serving whenactuated to Hush the selecting pneumatic 128 of the correspondingtracker A or B, thereby shifting the selecting mechanism intoinoperative position and stopping the sheet.

In selecting a composition near the end of the music sheet, the latteris liable to unwind completely from the music roll. To prevent this,means are provided for automatieally disconnecting the selecting gear126 from the driving gear 19,1130 stop the forward travel of the sheetand shifting the roll-driving mechanism into rewind position. Toaccomplish this, the select-off valve 142 of tracker A is connected by aconduit 149 with the channel 150 leading to a port 151 controlled by thepallet 61c which in turn is controlled by tracker A. The select-offvalve 145 of tracker B is likewise connected by a conduit 152 with achannel 153 and port 153, the latter being controlled by the pallet 48,which is in turn controlled by tracker B. By this arrangement, theselect-off valve 142 or 145 is actuated simultaneously with the primaryrewind Valve 81 or 89 by the opening of the rewind pallet 61c or 48, asthe case may be, throwing the selecting mechanism of either tracker intoinoperative position `and at the same time shifting the correspondingrewinding mechanism into operative position.

Under ordinary conditions, each roll driving mechanism is automaticallythrown into rewind. position after the corresponding music sheet hasbeen fully played and continues to rewind the sheet until it isautomatically stopped. The selecting is done manually and as theoperator is apt to do so during the rewinding operation, means must beprovided t-o shift the corresponding ,transmission gear 21 into neutralor inoperative position before the selecting mechanism is thrown intooperative position, otherwise the rewind mechanism will interfere withthe selecting mechanism. This shifting action is accomplished preferablyby the following means:

154, 154tL indicate conduits leading from ports controlled by theselecting` buttons 139, 141, respectively. The conduit 154 connects withthe conduit 95 associated with the rewind off or releasing valve 83which controls the rewind pneumatic 24 of tracker A. The conduit 154ELconnects with the conduit 90 associated with the rewind oft or releasingvalve 89 which controls the rewind pneumatic 24 of tracker B. It followsth at when either of these selecting buttons is operated thecorresponding' selecting pneumatic 128 is collapsed. shifting theselecting gear 126 into operative position, while the correspondingrewindy pneumatic is iushed, shifting the associated transmission gears21, 22 into inoperative position.

Mechanical means are also preferably employed to prevent the shipper arm2O from being shifted into rewindvor take-up position while the arm -127of the selecting mechanism is in its operative or selecting position.These devices consist of links 127@L and 127 pivoted to the arm 127 andextending downwardly on either side of the driving` shaft 18. 20 and 2Obindicate screws passing through slots 127c and 127 d in said links,respectively. Then the arm 127 is in its lower or playing position, theupper ends of these slots bear against the screws 20a, 20h, locking ltheshipper arm 2O against movement. These slots are of such a length thatwhen the arm 127 is in its inoperative position. as shown in thedrawings, the arm 20 is allowed to move up or down the required distanceto throw the transmission gears 21, 22 into take-up or rewind Position.lVhen the arm 2O is shifted into either of these positions, it locks thearm 127 in its inoperative position throughV the medium of the slottedlinks 1272, 1271, in an obvious manner.

As before stated, after one music sheet has finished playing, aperforation at or near its end causes the other' sheet to start playing.As the operator might be in the act of selecting a piece on the idlemusic sheet at the time this change occurs, mea-ns are provided to cutoff each selecting pneumatic 128 from the suction chamber 32, an instantbefore the corresponding playing pneumatic 23 is collapsed. This allowsthe spring 130 to withdraw the selecting gear 126 from the drive gear19, preventing said selecting gear from interfering with the operationof the playing gear 22. To accomplish this an additional port 151iL isconnected with the conduit 149 leading to the releasing or select offvalve 142 which serves to flush theselecting pneumatic 128k of trackerA, said port 151a being` controlled by the rewind pallet 48 of trackerB. For the same purpose, an additional port 152 is connected with theconduit 152 leading to the releasing of select off valve 145 of trackerB, said port 152a being controlled by the rewind pallet 61C of trackerA. This arrangement renders it impossible for the selecting and playinggears 126 and 22 of the same tracker to come into operation at thesametime..

To permit manual as well as automatic control of the roll-drivingmechanism, the primary playing valve 39, rewind-oftn valve 83, selectoff-valve 142 of tracker A and the playing-off valve 68 of tracker B areconnected by conduits 155, 156, 157, 158, respectively, with `portscontrolled by a pallet actuated by a push button 159, while the primaryplaying valve 64a, rewind off-valve 89, select-off valve 145 of trackerB and the playing-oit' valve 56 of tracker A are connected by conduits160, 161, 162 and 163, respectively, to ports controlled by a palletactuated by a push button 164. By this manual control, either sheet canbe started and the other simultaneously stopped.

To manually control the rewinding of the idle music sheet, at will, theprimary rewind valve 81, primary play-off valve 56 and the select-offvalve 142 of tracker A are also connected by conduits 165, 166, 167,respectively, with ports controlled by a pallet actuated by a rewind-push-button 168, while the primary rewind valve 85, playing-off valve68 and the select off-valve 145 of tracker B are connected` by conduits169. 17 0, 171. respectively, with ports controlled by a pallet actuatedby a rewind push button 17 2.

17 3 inni .ates a controlling boX having chambers 174, 175 and a channel176 connecting them. Diaphragm .valves 177, 178

are adapted to ,normally close the ends of mosphere entering through theconduit 181,

opens both diaphragm valves 177, 178, and passes thence through theconduits 179, 180 and raises the playing-off valves 56 and 68, flushingwhichever playing pneumatic 23 is collapsed and stopping theroll-driving mechanism and music sheet controlled thereby. By thispush'button 182 the sheet which is being played may be stopped withoutaffecting the operation of the other sheet.

As best seen in Fig. 16, 183 indicates a pressure wind chest with whichis combined one or more stops, such, for violin pipes 184 whichordinarily play in concert with the piano treble.

This stop Vand its Valve mechanism may be of any suit-- able or wellknown construction. In the eX- ample shown in the drawings, they arelocated. in a case 185 adjacent to the piano. 186 indicates the pressurechamber connected with the usual pressure bellows 187 by the tube V188;189 one of the valves or pallets arranged in said chamber and V190 theusual stop-slide. As shown in Fig. 2, this slide may be operated by apneumatic 191, the movable board of which engages the slide. A spring192 tends to shift the slide to its closed position.. 193 indicates anauxiliary wind chest preferably arranged beneath the keytable and havingits suction chamber 194 connectedby trunks 195 and 5 with the Amainsuction bellows 3. The pneumatic 191 is connected by a conduit 196 witha valve chamber 197 in thechest 193, which chamber is connected with theatmosphere by port-s 198 and with the suction chamber 194 by ports 199.These ports are controlled by a duplex valve 200 of ordinaryconstruction, which in turn is controlled by a diaphragm 2003. Thepneumatic 191 is collapsed or inflated by the action of said valve,thereby shifting the stop-slide into open or closed position. The pipestop or stops may be coupled to either tracker to play in concert witheither of the music sheets, the mechanism shown in the drawings for thispurpose being constructed as follows:

It comprises two auxiliary stop wind chests 201c and 201.d containingValve mechanisms for controlling said stops. For brevity they will behereinafter referred to as wind chests C and D, and as they areidentical in. construction, a description of one will sufiice for both.They are preferably arranged below the key table and their suctionchambers 202 (iF ig. 2) are connected instance, asV

' arranged below with the main suction bellows 3 by the trunks 203, 204,195 and 5, as shown in Fig. 1. A, valve chamber 205 is connected withthe atmosphere by ports 206 and with the suction chamber 202 by ports207, which ports are controlled by a duplex Valve 208 the heads of whichare arranged on the outer side of said Valve chamber'. The valvechambers 205 of the chests C and D are connected by channels 209 andconduits 21,0 and 211, respectively, with the chamber beneath thediaphragm 200a Yof the main stopwind chest 193. Each channel 209 isinterrupted by a partition 212 and provided at opposite sides thereofwith ports 213, 214 adapted to be covered or uncovered by a valvediaphragm 216 secured to the wall of a pouch chamber 217. Then closedagainst the partition 212, this pouch Valve cuts oil'I communicationbetween the diaphragm 2001 and the valve chamber 205 and when openedestablishes communication betweensaid parts. A channel 218 provided withthe customary bleeds 219, 220 connects the valve chamber 205 with theunderside of the diaphragm 215 of the valve 206. The pouch chamber 217of chest C is connected by a conduit 221 and the conduit 33 with theValve chamber 34 of the secondary playing Valve 35, Fig. 12, while thepouch chamber 217 of the chest D is connected by a conduit 226 and theconduit 64 with the valve chamber of the secondary playing Valve 65.Each of said pouch chambers is thus exhausted simultaneously with thecorresponding playing pneumatics 23 keeping the pouch Valve 216 open aslong as said pneumatic remains collapsed.

When the valve 208- is raised by the diaphragm 215, atmosphere enteringthrough the channel 218 retains said diaphragm and Valves in thatposition while the atmosphere entering through the if'alve chamber 205,channel 209 and conduit 210 the diaphragm 200 and the valve 200, col--lapsing the pneumatic 191, shifting the slide 190 to open position andcausing the pipes to play in concert with the active music sheet.

During the playing of each music sheet, the controlling valve 208 in theother stop act-ion chest C or D is cut off from the tracker by anysuitable means, but I prefer to employ the mechanism shown in the drawings which is constructed as follows:

222 indicates a cut off chest whichmay be the chest 201d and whichcontains pouch or valve chambers 223, 224. One of these chambers, saythe chamber 223, is connected by a conduit 225 and the conduit 221 withthe same source of tension as the playing pneumatic 23 of tracker A,while the chamber 224 is connected by a conduit 226 and the conduit 64with the same source 0f tension as the playing pneumatic 23 of trackerB, whereby each of these chambers or 211 raises Cil is alternatelyexhausted and flushed simultaneously withthe respective playingpneumatics. Arranged in the cut ott chest 222 adjacent to the pouchchambers 223 and 221 are channels 227 and 228, respectively. The channel22' is connected by a conduit 229 with the diaphragm 215 of theauxiliary wind chest C and with a duct 230 of tracker A by a conduit231, while the channel 228 is connected by a conduit 232 with thediaphragm 215 ot the auxiliary wind chest D and with a duct 233 oftracker B by a conduit 231. The channel 227 is interrupted by apartition 235 and provided on opposite sides ot said partition withports 230 which are covered by a pouch valve or diaphragm 237 whichestablishes or cuts ott communication between the corresponding trackerduct and the diaphragm.

The channel 228 of tracker B has a similar partition 238 and a pair otports 239 controlled by a pouch valve 210.

As the conduit 221 leading from the pouch chamber 217 ot the chest 201Cand the conduit leading from the pouch chamber ot the cut-oitl chest 222are both connected with the conduit 33 leading to the playing pneumatic23 of tracker A, they are exhausted when said pneumatic is collapsed toplay the sheet of Vtracker A, thereby opening the pouch valves 210 and237 and establishing communication between the duet ,230 of tracker .Aand the diaphragm 215 and also between the valve chamber 205 ot theauxiliary chest 201c and the diaphragm 200:L of the valve 200 whichcontrols the slide pneumatic 191, thus coupling the pipe-stop to trackerA. At the same time, the pouch chamber 217 ot the chest 201d and thepouch chamber 221 of cut-ott chest 222 are both flushed simultaneouslywith the playing pneumatic 23 et tracker B, closing their respectivepouch valves and cutting off communication between the duct 233 oftracker B and the stop-controlling valve 200 of the chest 2011.

The raising of the controlling valves 208 is e'ccted by pert'orations211 in the music sheets registering with the ducts 230 and 233 of thetracker boards A and B in a well known manner. These valves are retainedin their raised position and released at the proper time by the valvemechanism shown in Fig. 11, which is similar to that illustrated in Fig.12. Referring to Figs. 2, 13 and 11, each of the chests 201C and 201*1contains a pouch chamber 213 which is connected by a channel 211 with avalve chamber 215 alsoarranged in said chest. This chamber communicateswith the atmosphere by ports 210 and with the suction chamber 202 by aport 217. Applied to these ports is a duplex releasing valve 218controlled by the usual diaphragm 219. The pouch chamber 213communicates with the suction chamber 202 and the channel 218 by ports2517 252, respectively, which are controlled -by a pouch or valve 250similar to the valve 58. Nhen the valve 218 is raised, the pouch chamber213 is exhausted, raising the pouch 250, as shown in Fig. 13, anduncovering the ports 251, and exhausting the channel 218, thus allowingthe valve 208 to drop and cutting ott communication between thediaphragm 200a of the stop chest 193 and the atmosphere. The diaphragms219 of the chests 201c and 201*l are connected by conduits 253 and 251with tracker ducts 255 ot trackers A and B, respectively, and arecontrolled by coperating peritorations 250 .in the music sheets. It willnow be understood that the valve 208 which is associated with the musicsheet that is playing for the time being effects the alternateexhaustion and iushing o1 the slide-controlling pneumatic 191.

For the purpose of manually controlling the stops when playing the pianomanually, additional mechanism is provided tor actuating the duplexvalve controlling the slide pneumatic 191, which constructed as tollows:

257, Fig. 2, indicates an auxiliary valve chamber located in the mainstop-chest 1.93 and provided with ports 25 8 an( 259 leading to theatmosphere and suction chamber, 191, respectively. These ports arecentroll .d by a duplex valve 200 actuated by a diaphragm 207 otordinary constructionl` the heads ot the valve being arranged on theoutside oit the valve chamber The latter is connected by a channel 201with a pouch chamber 202 which in turn is connected by a channel 203with the diaphragm 200. Obviously the raising and loweringot the valve200 causes a corresponding action of the valve 200 which controls themovement of the slide 191. The diaphragm 207 may be controlled directlya pallet or push button 209, similar to the pallet 138 and button 139,conveniently located at the front et the instrument. However, whenplaying automatically .it is desirable to render the manual controllingvalve 200 inoperative, and 'for this purpose it is preterably combinedwith a cut-0H? mechanism which includes a pouch chamber 201 located inthe cut-ott chest 222 and a coperating channel 205 adjacent to the pouchchamber. This channel is connected by a conduit 200 with the chamberbeneath the diaphragm 207 and by a conduit, 208 with an atmospheric ductcontrolled by the button Like the Channels 227 and 228, the channel 205is interrupted vby a partition. 270 and provided on opposite sidesthereof with ports 271 controlled by an ordinary pouch-valve 272. I Thepouch chamber 201 is connected by a conduit 2,01L with a valve chamber273 communicating by a port 271 with the atmosphere and a port 275 witha. suction chamber 276. The latter is connected by a conduit 277 and theconduit 5 with the main suction bellows 3. A duplex valve 278 actuatedby a diaphragm 279 controls the ports 274, 275. This diaphragm isconnected by a conduit 280 with a flushing channel 281 which may beinterrupted by a partition 282 and provided on opposite sides thereofwith ports 283, controlled by a D-valve 284. This valve is connectedwith a pair of motor-pneumatics 285 and 286 by a link 287. The pneumatic285 is connected by the conduits 288 and 221 with the suction conduit 33of the playing pneumatic 23 of tracker A, while the pneumatic 286 isconnected 'by conduits 289 and 226 with the suction conduit 64 of theplaying pneumatic 23 of tracker B. 1t follows that when either of theplaying pneumatics 23 is collapsed, the corresponding pneumatic 285 or286 is also collapsed, shifting the D-valve 284 in the proper directionto close the flushing channel 281 and cutting oilA the atmosphere :frombeneath the diaphragm 279. The valve 278 is therefore allowed to drop,admitting atmosphere to the chamber 264, closing the pouch valve 272 andcutting off the manual valve 260 from its controlling` device 269.

Then playing the instrument automatically, it is also desirable to cutoif communication between the suction chamber 194 of themanually-controlled compartment of the main stop wind chest and thediaphragm 200a of its automatically-controlled compartment, so that saidmanual control can not interfere with the operation of the valve 200inthe last-named compartment when actuated from the tracker boards. Tothat end, a pouch or cut-olf valve 290 is arranged in the pouch chamber262 of the main stop chest 193 and said chamber is connected by conduits291 and 264 with the valve chamber 273. The pouch chamber 262 is thuslikewise flushed when either of the pneumatics 285 or 286 is collapsed,closing the pouch valve 290 and cutting off communication between thesuction chamber 194 and the diaphragm 200,

The operation of the apparatus is as follows:

In Fig. 2, the parts of tracker A are in position to play its musicsheet, the parts of tracker B are in position to rewind its sheet andthe controlling perforation 92 at the end of the music sheet of trackerA has just come into register with the corresponding tracker-duct 79.Under these conditions atmosphere enters thisV tracker-duct and passesthrough the conduit 78 and raises the valve 7 6a (similar to the valve76, Figs. 2 and 15), establishing communication between the auxiliarysuction chamber 32 and the pneumatic 63, collapsing the latter andopening the pallet 61c shown in Fig. 7. Atmosphere now enters the port67a and conduit 66 and actuates the primary and secondary playing valves65, 65 ot tracker B, collapsing the playing pneumatic 23 ot said trackerB and moving the corresponding shipper arm 20 into playing position todrive the take-up roll. Simultaneously with this action, the drivingmechanism of tracker A is shifted into rewind position by the uncoveringof the port 81c by said pallet 61C. The atmosphere entering` said portand the conduit 81l causes the primary and secondary rewind valves 81and 82 to be shifted to the proper position to connect the rewindpneumatic 24 of tracker A with the auxillary suction chamber 32,collapsing it and shifting the corresponding arm 20 into rewindposition. This arm remains in this position until the music sheet oftracker A is rewound, when, the finger 97 enters the recess 104 of thecorresponding take-up roll and is tripped and caused to open thestoppallet 93 of tracker A. Atmosphere now enters the conduits 95 and83a and raises the rewind-oit or releasing valve 83, allowing theprimary rewind valve 81 and the secondary valve 82 to drop as beforedescribed, therebyflushing the rewind pneumatic 24 of tracker A,shifting the arm 20 into neu-- tral position and stopping the rewindoperation. Said arm is held in this position by the spring 28 shown inFig. 10.

The moment the music sheet oi. tracker B is taken up for playing, theplaying pneumatic 23 of tracker A is flushed, shift-ing thecorresponding shipper arm 20 to neutral position, and at the same timethe companion tracker board is disconnected from the main wind chest.This is eil'ected by the opening of port 61b controlled by the pallet61. Atmosphere thereupon enters the conduit 61 and raises the releasingor playing-oill valve 56, lowering the primary valve 39 and thesecondary valve 35 and flushing the playing pneumatic 23, through theconduit 3.3, as hereinbeiore described, and simultaneously flushing thecut-off chamber 108 through the conduit 110 branching from the conduit33. The pouch valves 121`V are thereby closed, breaking communicationbetween the board 6 of tracker A and the main wind chest 1. The pouchvalves 124 of the other cut-oli' chamber 109 are at the same timeopened, as before explained, estalblishinf` communication between theboard oi tracker B and said main wind chest.

The music sheet of tracker B continues to play until its controllingperforation 92 registers with the corresponding tracker duct 79,whereupon atmosphere enters the conduit 78 and raises the valve 76,Fiofs. 2 and 15, connect-ing the pneumatic 50 Fig. 7) with the auxiliarysuction chamber 32 and collapsing it and opening the pallet 48.

The atmosphere now enters the ports 68a and conduit 87, causing theprimary and secondary valves S5 and 86 to be raised and the rewindpneumatic 2-1 ot tracker B to be collapsed, as hereinbetore described,thereby moving the corresponding rock arm 20 to the position shown inFig. 2 and rewinding said sheet.

The opening. of the pallet l1S causes the pneumatic 23 of' tracker A tobe collapsed, again taking up the corresponding sheet; at the same timethe pouch valves 121 of tracker A are opened and the pouch valves 124.of tracker B are closed, thus silencing the latter.

1f, while the music sheet of tracker A is playing and the music sheet oftracker B is rewinding, it is desired to play the sheet of tracker B andstopthe sheet ot' tracker A, the button 1611 shown in Fig. 2 is pressedby the operator. Atmosphere through the duf-ts 160 and 66 actuates theprimary and secondary playing valves 64, 65, collapsing the playingpneumatic 23 of tracker B, and shitting the respective arm 2O intoplaying position, while atmosphere entering the ducts 163 and 61Lactuates the releasing valve 56 of tracker A, shitting the arm 20 otthelatter into neutral or stop position, as ieit'ore described.

In a similar manner, the sheet-driving mechanism oit trackerl A may bemanually thrown into playing position while the sheet of tracker B isplaying, by pressing the button 159, the conduit 155 leading from thisbutton to the conduit 44; which leads to the actuating-diaphragm of theprimary valve 39.

To select some particular piece on the music sheet of tracker B whilethe music sheet of tracker A is playing, the operator pushes the button141. By this movement atmosphere is admitted to the duct 140, actuatingthe primary and secondary selecting valves 135 and 133, collapsing theselecting pneumatic 128 of tracker B, thereby engaging the selectinggear126' with the gear 19 and driving the take-up roll forward at increasedspeed. At the end of each piece on the sheet, a select-off perforation1418 is cut which is arranged to register with the tracker duct 147.lVhen this occurs, the select-off valve 141-5 is actuated and in turnactuates said primary `and secondary select valves, as before described,thereby throwing the selecting mechanism into inoperative position. 1tis necessary to press the select button 141 at the end of each pieceuntil the desired composition is brought in position ready to be played.Selections may likewise be made on the sheet of tracker A by pressingthe button 1.39.

r1`he moment the sheet of tracker A starts playing, the pouch or couplervalve 216 of the chest C and the pouch valve 237 ot the chamber 223areopened, as shown in Fig. 2, establishing communication between thevalve :hainber 205 of chest C and the diaphragm 2O()a et theslide-controlling valve 200, and between the conduit 231 of tracker Aand the diaphragm 215 ot chest C, and whenever a pipe-stop perforationof the sheet ot tracker A passes the latter, the valve 20() is actuatedand the slide 190 is opened,causing the pipes to play in concert withthe piano. 1n like manner, when trzicker B begins to play, the pouchvalve 216 of the chest D and the pouch coupler valve 2-1-0 are opened,establishing communication between the valve chamber 205 et chest D andsaid diaphragm 200 and between the conduit 234e of tracker B and thediaphragm 215 ot chest l); and whenever a pipe-stop perforation oftracker B passes the latter, the valve 200 is actuated and the pipes arecaused to play in concert with the piano. lhenever one of theperforations 256 registers with the duct 253 of either tracker, thecorresponding releasing valve 2-1-3 is actuated, lowering the valves 20Sand 200, [iushing the pneumatic 191 and allcuving the spring 192 toclose the stopslide 190.

Should 'tracker B, for example, be thrown linto operation manually bypressing the button 16-1, while tracker A and the pipe-stops are playingin concert, the playing-oit valve 56 ot tracker A will be actuated,thereby flushing the playing pneumatic 23 of tracker A and returning4the corresponding rolldriving mechanism to neutral position. At thesame. time the conduit 221 is also flushed, thus closing the pouch valve216 of the chest C and the pouch-valve 237 in chamber 223, andcuttingthe tracker A off from the chest C and the latter off from theslide-controlling valve 200.

TWhen the piano is played manually, the pneumatics 285 and 286, Fig. 2,are both in their inflated position and the D-valve is in position toadmit atmosphere under the diaplnfagm 279, thus raising the valve 27 8,

- exhausting the pouch chamber262 and opening the pouch or coupler valve290 to establish communication between the diaphragm 2O()n ofthe mainslide-controlling valve 20() and the valve-chamber 257 ot the auxiliaryslide-controlling valve 260. Under these conditions should it be desiredto manually throw on the pipe-stop to play in concert with the piano,the performer presses the button or tablet 269, whereupon the atmosphereentering through the duct controlled bythe same opens the pouch orcoupler valve 271, passes through the conduit 266 and lifts theauxiliary slide-controlling valve 260, thereby causing the mainslide-controlling valve 200 to rise, 'collapsing the pneumatic 191 andopening the stop-slide 190.

Various changes or modiications coming within the scope of the appendedclaims, may obviously be made in the instrument, and I do not thereforewish to be limited t0 the particular construction herein shown anddescribed.

I claim as my invention:

1. In an instrument of the character described, the combination of awind chest, a

plurality of tracker mechanisms each in-` cluding a tracker board andmusic and takeup rolls associated therewith, driving mechanism includingshiftable members for alternately rotating the rolls of each tracker inopposite directions, playing pneumatics for moving said shiftablemembers into playing position, a pneumatic cut-off for each tracker todisconnect the same from the wind chest, the playing pneumatic and thecut off of each tracker' being connected together to act in unison,valve mechanism for controlling said playing pneumatics and cut-offs,rewind pneumatics for lmoving said shifting members into rewindposition, valve inechanism for controlling said. rewind pneumatics, andpneumatic Vactions controlled by the trackers for actuating said valvemechanisms.

2. In an instrument of the character described, the combination of aplurality of trackers, roll-driving mechanism associated with eachtracker, a set of playing and rewind pneumatics for controlling each ofsaid roll-driving mechanisms, valve mechanisms controlling saidpneumatics, a ductboard having playing and rewind ducts cooperating withsaid valve -mechanisms, valves coperating with said duct-board and eachcontrolling the playing duct of one tracker and the rewind duct ofanother tracker, and means for controlling said ductboard valves.

In an instrument of the character described, the combination of aplurality of trackers, each having a controlling duct, roll-drivingmechanism associated with each tracker, a set of playing and rewindpneumatics for controlling each of said rolldriving mechanisms, valvemechanisms controlling said pneumatics, a duct-board having playing andrewind ducts coperating with said valve-mechanisms, valves coperatingwith said duct-board and each controlling the playing duct of onetracker and the rewind duct of another tracker, and means controlled bysaid tracker ducts for actuating said duct-board valves.

l. In an instrument of the character described, the combination of aplurality of trackers, each having a controllingrduct, roll-drivingmechanism associated with each tracker, a set of playing and rewindpneumatics for controlling each of said rolldriving mechanisms, valvemechanisms controlling said pneumatic. a duct-board having playing andrewind ducts coperating by said driving with said valve mechanisms,valves coperating with said duct-board and each controlling the playingduct of one tracker and the rewind duct of another tracker, meanscontrolled by said tracker-ducts for actuating said duct-board valves,and manual valves also controlling the ducts of said duct-board.

5. In an instrument of the character described, the combination of aplurality of trackers, roll-driving mechanism associated with eachtracker, a set of playing and rewind pneumatics for controlling each ofsaid roll-driving mechanisms, valve mechanisms controlling saidpneumatics, a ductboard having playing and rewind ducts cooperating withsaid valve mechanisms, valves coperating with said duct-board and eachcontrolling the playing' duct of one tracker and the rewind duct ofanother tracker, separate pneumatics for actuating said duct-boardvalves, and pneumatic ae'- tions controlling the last-named pneumaticsand in turn controlled by the trackers, respectively.

G. In an instrument of the character described, the combination of themusic and take-up rolls, rewind and take-up gears for said rollsrespectively, a driving member,

lshiftable main transmitting gears for alternately connecting up gearswith said said rewind and takedriving member, a shiftable auxiliary gearfor transmitting motion from said driving gear to the take-up roll, andmeans for locking said main transmission gears in neutral. position whensaid auxiliary gear is shifted to operative position and vice versa.

7. In an instrument of the character described, the combination of themusic and take-up rolls, a rewind shaft having a gear, a take-up shafthaving dilferent sized gears, a driving gear, a shipper member carryingmain transmission gears arranged to alternately engage said rewind gearand one of the geais of said take-up shaft, said transmission gearsbeing driven by said driving gea-r, an auxiliary selecting gear arrangedto transmit motion from said driving gear to the other gear of thetake-up shaft, a movable supporting-member for said selecting gear, andmeans controlled by said supporting member for lockingv said shippermember in neutral-position. A

8. In an instrument of the character described, the combination of themusic and take-up rolls, a rewind shaft having a gear,

' a take-up shaft having different sized gears,

adriving gear, a Shipper arm fulcrumed between its ends on the shaft ofsaid driving gear and carrying main transmission gears arranged toalternately engage said rewind gear and one of the gears of said take-upshaft, said transmission gears being driven gear, an auxiliary selectingrampes gear arranged towtransinit motion fromsaid driving gear to theother gear of the take? up shaft, a movable supporting-ineinber for saidselecting gear, and slotted locking links pivoted to said supportingmember and connected with said shipper member by fpins passing throughtheir slots and arrangedk on opposite sides of the driving-gear shaft.

9. In an instrument of thencharaeter described, the combination of themusic and take-up'rolls, a. rewind shaft having a gear, a take-up shafthaving different sized gears, a driving gear, a shipper member'carryingmain transmission gears arranged to alternately engage said rewind gearand one of the gears of said take-up shaft, said transmission gearsbeing dri'ven by said driving gear, an auxiliary selecting gear arrangedto transmit motion fromfsaid driving gear to the other gear ofthe'take-up` shaft, a inovable supporting-member for said selectinggear, and locking means controlled by said shipper and supportingmembers and arranged to lock one of said members in neu? tral positionwhen the other is shifted to operative position.

10. In an instrument of the character described, tlie combination of aplurality of trackers eaclihaving a controlling duct, rolldrivingmechanism associated with each tracker, a set of playing andrewindpneumatics for controlling each of said roll-driving mechanisms,rewind valves controlling the respective rewind pneumatics, valve-mechanism for controlling each of said playing pneumatics, each of saidplaying valve mechanisms including means for retaining the playing valvein position to exhaust the associated playing pneumatic and a releasingvalve for causing said playing valve to resume its normal posit-ion toflush said playing pneumatic, a controlling box containing flushingchambers and a channel connecting said chambers, valves applied to saidchannel, conduits leading from said chambers to said releasing valves,respectively, and manual means controlling the admission of theatmosphere to saidv channel.

11. In an instrument of the character described, the combination of aplurality of trackers, roll-driving mechanism associated with eachtracker, a shipper member for the driving mechanism of each tracker,shifting pncuinatics for said members, a pneumatic action controllingsaid shifting pneumatics and each comprising a. suction chamber, avalve-chamber connected with one of said pneuinatics and communicatingby ports with said suction chamber and the atmosphere, avalve-controlling said ports and a diaphragm for actuating the valve,means for retaining said valve in its operative position including a.suction-channel leading from said diaphragm to said suction-chamber, avalve controlling said channel, and a releasing valve controlled by oneol' said trackers and controlling the last-named valve.

. 12. In an instrument of the character described, tlie combination of aplurality of trackers, roll-driving mechanism associated ith eachtracker, playing pncuinatics controlling said driving mechanisms, valvemechanisms controlling said piieuinatics, a pipe-stop having a slide, apneumatic for shifting said slide, a plurality of pneumatic stop-actionscontrolling said slide-shifting pneumatic and respectively controlled bythe trackers, and means controlled by the 'valve mechanisms of saidplaying piieuinatics for rendering each of said stop-actions opera tiveor .inoperative simultaneously with the corresponding playing pneumatic.

13. In an instrument of the character described, the combination of aplurality of trackers, roll-driving` mechanism associated with eachtracker, playing pneumatics con- 1trolling said driving mechanisms,valve mechanisns controlling said pneumatics, a pipe-stop and its slide,y a shifting pneumatic for said slide, a main stop wind chest containinga main valve for controlling said slide-pneumatic, auxiliary stop windchests, respectively associated with the trackers and each containing anauxiliary valve which controls said main valve, each of said auxiliaryvalves being controlled by one of the trackers, `and separate cut-offsbetween said auxiliary val ves and said main valve, controlled by thevalve-ineclianisins of said playing pneuinatics.

14. In an instrument of the character described, the combination of aplurality of trackers having controlling ducts, roll-driv ing mechanismfor each tracker, a playing pneumatic associated with each tracker forcontrolling the respective roll-driving mechanism, valve mechanismscontrolling said playing pneumatics, a pipe-stop having a slide, ashifting pneumatic for said slide, a main stop-Wind chest containing amain valve controlling said slide-pneumatic, auxiliarystop wind-chestseach containing an auxiliary valve which controls said main valve,pneumatic cut-offs interposed between said auxiliary valves and saidmain valve Iand respectively controlled by the valve mechanisms ot saidplaying pneuinatics, conduits leading from said tracker-ducts to saidauxiliary valves, respectively, and pneumatic cut-oii's interposed insaid con duits and controlled by the valve mechanisms of the playingpneuinatics.

15. In an instrument of the character described, the combination of aplurality of trackers, roll driving mechanism associated with eachtracker, playing pneumatics controlling said driving mechanisms, valvemechanisms controlling said pneuinatics, a

scribed, the combination of a pipe-stop and its slide, a shiftingpneumatic for said slide, a main stop Wind-chest containing a main valvefor controlling said slide-pneumatic, auxiliary stop Wind chests,respectively associated with the trackers and each containing anauxiliary valve which controls said main valve, each of said auxiliaryvalves being controlled by one of the trackers, cut-off means betweeneach of said auxiliary valves and said main valve, and amanually-controlled valve also controlling said main valve. c

16. In an instrument of the character deplurality of trackers, rolldriving mechanism associated with each tracker, playing pneumaticscontrolling said driving mechanisms, valve mechanisms controlling saidpneumatics, a pipe-stop and its slide, a shifting pneumatic for saidslide, a main stop Wind-chest containing a main valve for controllingsaid slide-pneumatic, auxiliary stop Wind chests, respectivelyassociated with the trackers and each containing an auxiliary valveWhich controls said main valve, each of said auxiliary valves beingcontrolled by one of the trackers, cut-ofi' means between each of saidauxiliary valves and said main valve, a manually-controlled valve alsocontrolling said main valve, and means for automatically cutting-01Tsaid manual valve from said main valve when the latter is actuatedautomatically.

17. In an instrument of the character described, the combination of apluralityrof trackers, roll-driving mechanism associated with eachtracker, playing pneumatics controlling said driving mechanisms, valvemechanisms controlling said pncumatics, a pipe-stop having a slide, a.pneumatic for shifting said slide, a plurality of pneumatic stopactionscontrolling said slide-shifting pneumatic and respectively controlled bythe trackers, means controlled by the valve mechanisms of said playingpneumatics for rendering each of said stop-actions operative orinoperative simultaneously with the corresponding playing pneumatic, asupplemental pneumatic valve also controlling said slide-shiftingpneumatic, manual means for controlling the last-named valve including aconduit leading thereto, a cutoff chamber interposed in said conduit andcontaining a cut-ofi' valve, a pneumatic action including a valvechamber connected with said cut-ofil chamber, a valve controlling theexhaustion and flushing of said chamber and a diaphragm controlling saidvalve, an 'atmospheric conduit leading to said diaphragm, a valveapplied to the lastnamed conduit and shifting pneumatics for thelast-mentioned valve controlled by the valve mechanisms of said playingpneumatics. i

LOUIS S. LOCKWOOD.

Copies of this patent may be obtained for dve cents each, by addressingthe Commissioner of Patents. Washington, D. C."

